Guide to fencing: hedges, walls, trellis, panels - House Beautiful.5 Sep 2016 . A good example of this is semi-solid fencing, such as Venetian slatted panels, which also let in light and cast interesting shadow patterns around the garden. Acoustic fencing . Panels need to be raised 5cm from the ground so they don't rot, or sit them on top of treated or concrete gravel boards. Putting up.